Taraguchi-N opening rule is a renju opening rule. It was offered by RIF members (Russia and Estonia) as an advancement of a Taraguchi opening rule.
The black player puts the first move in the center of the board.
The other player may swap.
The white player will put the 2nd move within 3x3 central square.
The other player may swap.
The black player will put the 3rd move within 5x5 central square.
The other player may swap.
The white player will put the 4th move within 7x7 central square.
The choice 1 (after the 4th move):
The other player may swap.
The black player will put the 5th move within 9x9 central square.
The other player may swap.
The white player plays the 6th move anywhere on board.
The choice 2 (after the 4th move):
The black player puts N (number declared in the name of exact rule implementation) 5th moves anywhere on board (symmetrical moves are not allowed).
The white player chooses one of the offered 5th moves and plays the 6th move anywhere on board.
This rule offers a good variety of playable variants in the openings that aren't playable by Yamaguchi opening rule like 13D, 13I, 12D, 10D.
On the other hand, this rule limits playable openings to those which don't have N winning 5th moves. Having N big enough (10 for instance) all the playable 5-move positions are available.
